O Paleolago Cemitério, Catalão, Goiás, é um depósito lacustre rico em espículas de esponjas continentais. Essas espículas, que estão presentes em três. This Pin was discovered by Joelma Martins Fonseca. Discover (and save!) your own Pins on Pinterest. A sustentação das células das esponjas é feita por lamentos calcários chamados de espículas. Nas esponjas também não há sistemas responsáveis pelas.

Author: Nikoran Taum
Country: Bahrain
Language: English (Spanish)
Genre: Photos
Published (Last): 10 March 2016
Pages: 189
PDF File Size: 1.67 Mb
ePub File Size: 1.27 Mb
ISBN: 370-6-43165-755-2
Downloads: 82155
Price: Free* [*Free Regsitration Required]
Uploader: Akinokasa

The siliceous spicules of continental sponges can be seen in sedimentary rocks due to their amorphous silica composition opal. Optically stimulated luminescence dating of young sediments. Dosilia Porifera, Demospongiae redefined.

Espícula (esponja) – Viquipèdia, l’enciclopèdia lliure

Either way, both hypotheses point to the lakes appearing as a result of the erosion occurred in an area of karstic relief. Few spicules of C. The second hypothesis involves a small-scale localized collapse, which could result in a esopnjas in the volume of the rock that causes subsidence.

Tubella spinata Carter Heterorotula fistula Volkmer-Ribeiro and Motta Volkmer-Ribeiro also reported this same assemblage, with the exception of H.

Iheringia, Ser Zool 97 2: Data were collected by Dr. Acta Microsc 5 B: An indigenous assemblage of lentic sponges was found, consisting of Metania spinata CarterDosilia pydanieli Volkmer-RibeiroRadiospongilla amazonensis Volkmer-Ribeiro and MacielTrochospongilla variabilis Bonetto and Ezcurra de DragoCorvomeyenia thumi TraxlerHeterorotula fistula Volkmer-Ribeiro and Mottaplus Corvoheteromeyenia australis Bonetto and Ezcurra de Dragowhich here has its first record in an assemblage formed by biosiliceous deposits.

Espiculas de esponja | Biologia de inverterbrados | Pinterest

Sponge spicules in sediments indicate evolution of coastal freshwater bodies. La espicuas lacustre indicateur de changements des paleoenvironments aucours des Manuscript received on June 15, Accepted for publication on October 26, They also pointed to a relationship espiculqs this ezponjas and transgressive events prior to the studied formation.

  ALESIS DM4 MANUAL PDF

The alternation of clay Layers 2, 3, 4, 6, 8, 9, 10, 12, 13, 15 and 16, Section 2 and conglomerates Layers 1, 5, 7, 11 and 14, Section 2 is indicative of such a process Fig. Furthermore, they highlighted the moment when the gemmoscleres of H. The temporary lake consists of a small body of water that during the rainy season does not exceed two meters in the center and can dry up completely at the height of the dry season.

Rare spicules of C.

Espícula (esponja)

They also concluded that the sequence of spicules observed in both profiles indicated a global climate change, with stages of retraction and expansion of forests during the last 30, years, which is supported by pollen and geochemical analysis. History and classification of the know species of Spongilla. Palaeogeogr Palaeoclimatol Palaeoecol Spongofacies as in Layer esponuas.

Corvomeyenia thumi Volkmer-Ribeiro Intriguingly, no living specimens of H.

Three slides were prepared for each horizon subsample. On Metania spinata Carter, and Metania kiliani n. Later, Volkmer-Ribeiro reported the occurrence of the species R. Nuevos aportes al conocimiento de las esponjas argentinas. Oncosclera navicella Carter Fig.

We identified 25 spongofacies horizons caused by sponge assemblages typical of a lentic environment, dated from at least 39, years BP. The presence of spicules in different rocks was visually evaluated and qualified by OM permanent slides and in the rock fragments Stereoscopic Microscope – magnifying glass as: Spongofacies with spicules of M.

For the Optical Microscope OM identification of the sponge spicules in the sediments, a specific laboratory technique was applied to obtain permanent slides. Likewise important esponjzs microscleres and megascleres, which are the spicules that make up the body of the animal. This interpretation is supported by the stratigraphy at Section 1 whose the basal section is dominated by coarse particle sizes suggesting deposition in a esponjxs uni-directional flow.

  ALGEBRA DE MANCIL PDF

Dosilia pydanieli Volkmer-Ribeiro Few spicules, differing from that of Layer 1 by the absence of E. Corvoheteromeyenia australis Bonetto and Ezcurra de Drago Figs. Rev Bras Geocienc 31 4: Comprehensive revision of a worldwide collection of freshwater sponges Porifera: However, Volkmer-Ribeiro and Espivulas pointed out that the species of the genus Heterorotulahitherto endemic to Australia, appear in environments that are seasonally exposed to drought and form delicate crusts on the roots of aquatic vegetation, with a consistency ranging from fragile to hard, but brittle.

Spongofacies differing from that of Layer 11 by the presence of O. At that time, the term “spongofacies” was proposed and defined for facies with a predominance of sponge spicules that, when identified, indicate specific paleoenvironmental characteristics.

Use of Esponjaas as a proxy for river-lake paleohydrology in Quaternary deposits of central-western Brazil.

Spongofacies differing from that of Layer 3 by the absence of C. Radiospongilla amazonensis Volkmer – Ribeiro and Maciel Rsponjas 1, 2, 3 and 4 of Section 2 Fig.

Furthermore, at the base of the sections, spicules of sponges from lotic environments were detected, including Corvospongilla seckti Bonetto and Ezcurra de DragoOncosclera navicella Carter and Eunapius fragilis Leidywhich suggests a contribution from flowing water. Kunth Tavares et al. Few spicules of M.

Rev Bras Dr 12 2: